Abstract: According to an image forming device according to the disclosure, a required toner amount is calculated based on image data. A toner replenishment device replenishes a development device with toner of a first replenishment amount included in the required toner amount. Toner of the remaining second replenishment amount included in the required toner amount is replenished, based on a toner concentration detection value of a toner concentration sensor. When the image forming device stands continuously unused for a predetermined threshold time or longer, the toner of the second replenishment amount is not replenished during a time period from when an image forming process is started immediately after the unused time, until a specific time elapses.

Abstract: According to an image forming device of the present disclosure, a required replenishment amount is calculated based on a printing rate derived from image data, and toner is replenished to a development device by a toner replenishment device for a required replenishment time in accordance with the required replenishment amount. Then, a time difference obtained by subtracting a printing time per sheet from the required replenishment time is accumulated, and a determination regarding forcible replenishment of the toner is made based on a comparison between an accumulated required replenishment time and an accumulated required replenishment time threshold value.

Abstract: A development device includes a developer housing, a toner concentration detection sensor, and a cover member. The developer housing stores a developer containing toner and a carrier. The toner concentration detection sensor is attached to a lower surface of the developer housing and is configured to detect a toner concentration of the developer stored in the developer housing. The cover member is attached to the lower surface of the developer housing to cover the toner concentration detection sensor. The cover member includes a pressing section for pressing a part of the toner concentration detection sensor against the lower surface of the developer housing.

Abstract: A development device includes a developer housing, a toner concentration detection sensor, and a cover member. The developer housing stores a developer containing toner and a carrier. The toner concentration detection sensor is attached to a lower surface of the developer housing and is configured to detect a toner concentration of the developer stored in the developer housing. The cover member is attached to the lower surface of the developer housing to cover the toner concentration detection sensor. The cover member includes a pressing section for pressing a part of the toner concentration detection sensor against the lower surface of the developer housing.

Abstract: A cleaning device (100) according to the present invention is constituted by including in a cleaning nozzle member (21) provided inside a cleaning tank (2): a large pipe diameter part (211) that supplies a cleaning fluid (31) pressure-fed from a retention tank (3); a small pipe diameter part (212) that increases the speed of a flow rate for the cleaning fluid (31) flowing in the large pipe diameter part; a conical pipe diameter part (213) that generates a fluid that includes minute bubbles by cavitation; and a guide pipe diameter part (214) for accommodating an object (5) to be cleaned. The cleaning fluid (31) is ejected to the entirety of the object (5).

Abstract: A cleaning device (100) according to the present invention is constituted by including in a cleaning nozzle member (21) provided inside a cleaning tank (2): a large pipe diameter part (211) that supplies a cleaning fluid (31) pressure-fed from a retention tank (3); a small pipe diameter part (212) that increases the speed of a flow rate for the cleaning fluid (31) flowing in the large pipe diameter part; a conical pipe diameter part (213) that generates a fluid that includes minute bubbles by cavitation; and a guide pipe diameter part (214) for accommodating an object (5) to be cleaned. The cleaning fluid (31) is ejected to the entirety of the object (5).